344 



Hartley and Ramage — Banded Flame-Spectra of Metals. 



It will be noticed that several lines belonging to the spark-spectra have nearly the 

 same wave-length as lines or edges of bands in the flame-spectra of the same elements ; 

 but the lines are not really the same, they are not lines common to both spectra. 



There is a strong continuous spectrum between the wave-lengths 5900 and 3530. 



The following are wave-lengths of the ends of the bands in Liveing and 

 Dewar's magnesium-hydrogen spectrum : — 5618 to 5578, 5566 to 5526, 5513 to 

 5458, 5210 to 5183, 5180 to 5112, 4849 to 4813, 4803 to 4772. 



The Flame-Spectrum of Zinc, 



Between wave-lengths 5900 and 3530. 



Bands composed of fine lines, degraded towards the violet. 



The bands composing this spectrum can be distinguished as far as the edge of 

 the plate (\ 3530) ; but the component lines of the bands are too feeble and 

 nebulous to admit of accurate measurements being made. 



The lines are more widely separated as they approach towards wave-length 

 3530. The spark lines of similar wave-lengths to those of lines in the flame- 

 spectrum are not the same, but really different lines. 



